171100661 has 4 divisors (see below), whose sum is σ = 171126924. Its totient is φ = 171074400.

The previous prime is 171100639. The next prime is 171100673. The reversal of 171100661 is 166001171.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 70980625 + 100120036 = 8425^2 + 10006^2 .

It is a cyclic number.

It is not a de Polignac number, because 171100661 - 2¹⁸ = 170838517 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (171100621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4841 + ... + 19121.

It is an arithmetic number, because the mean of its divisors is an integer number (42781731).

Almost surely, 2^171100661 is an apocalyptic number.

It is an amenable number.

171100661 is a deficient number, since it is larger than the sum of its proper divisors (26263).

171100661 is a wasteful number, since it uses less digits than its factorization.

171100661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26262.

The product of its (nonzero) digits is 252, while the sum is 23.

The square root of 171100661 is about 13080.5451339002. The cubic root of 171100661 is about 555.1588009723.

The spelling of 171100661 in words is "one hundred seventy-one million, one hundred thousand, six hundred sixty-one".